REVIEW 4 major objections 6 minor 157 references
Using failed supernovae to constrain the Galactic r-process element production
T0 review · 4 major / 6 minor · reviewed 2026-08-14 · deepseek-v4-flash
Pith's one-line read Neutron star–black hole mergers, fed by failed supernovae at low metallicity, resolve the two long-standing puzzles of Galactic r-process enrichment: its presence at very low $[\mathrm{Fe/H}]$ and its large scatter there.
desk verdict A plausible and clearly argued case for BH-NS mergers as a second r-process site, but the central mechanism rests on an extreme low-metallicity failed-SN prescription that the paper tests only in one direction. read the letter →
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
What carries the argument
The engine is the inhomogeneous chemical evolution code ICE, a $(2\,\mathrm{kpc})^3$ box divided into $100^3$ cells of 20 pc, run in 1 Myr timesteps, tracking individual stars, supernovae, and compact binary mergers rather than a smooth average. The load-bearing new ingredient is a simplified explodability prescription: stellar collapse outcomes come from the PUSH core-collapse supernova simulations at solar metallicity (failed explosions for $22.8\text{--}25.6\,M_\odot$), and at $\mathrm{Z} \le 10^{-2}\,\mathrm{Z}_\odot$ the authors test three extreme cases in which all stars above 20, 25, or $30\,M_\odot$ collapse directly to black holes, ejecting no iron. That prescription does two jobs: it suppresses iron production at low metallicity, slowing the $[\mathrm{Fe/H}]$ enrichment and shifting the age-metallicity relation, and it creates the black holes that allow BHNSMs—which, needing only one neutron star, inject r-process material into cleaner gas and produce a per-event $[\mathrm{Eu/Fe}]$ boost twice that of NSMs. Merger rates enter through an effective probability $P_{\mathrm{r-proc}} = 4\%$ per massive star, calibrated to about $1.03\times10^{-4}$ compact binary mergers per solar mass of stars formed, corresponding to roughly $1800\,\mathrm{Gpc}^{-3}\,\mathrm{yr}^{-1}$.
What would settle it
Run multi-dimensional core-collapse supernova simulations for stars between 30 and 50 solar masses at a metallicity one hundredth of solar and count how many successfully explode; if most explode, the model's low-metallicity iron suppression and early black hole–neutron star merger rate would disappear.
Extended reading notes
Core claim
The central claim is that "an adequate combination of neutron star mergers and neutron star-black hole mergers qualitatively reproduces the observed r-process abundances in the Galaxy." The simulation reproduces both troublesome observations: r-process-rich stars at very low $[\mathrm{Fe/H}]$ and the large $[\mathrm{Eu/Fe}]$ scatter at low metallicity that narrows in the disk. The mechanism has two prongs. A BHNSM requires only one core-collapse supernova to produce its neutron star, so its r-process ejecta land in gas enriched by half as much iron as a neutron star merger would require; and failed supernovae at low metallicity remove iron sources from the production chain, slowing the rise of $[\mathrm{Fe/H}]$ so that mergers can pollute nearly pristine gas. In the fiducial case (all stars above $30\,M_\odot$ failing at $\mathrm{Z} \le 10^{-2}\,\mathrm{Z}_\odot$), BHNSMs and NSMs contribute comparably at the earliest times, and BHNSMs then decline to about 10% of all compact binary mergers after about 400 Myr.
Load-bearing premise
The whole scenario hangs on the assumption that in the early, metal-poor Galaxy nearly all very massive stars—in the fiducial case every star above 30 solar masses—fail to explode and turn into black holes, contributing no iron; if most of them actually explode, the proposed early mergers would be too rare and too iron-polluted to match the data.
Editorial extensions
If this is right
- If the scenario is right, neutron star–black hole mergers are a viable second r-process site, and the early europium enrichment does not require magnetorotational supernovae or collapsars.
- The first r-process enrichment events can occur at substantially lower $[\mathrm{Fe/H}]$ than in neutron-star-merger-only models, because only one supernova has polluted the gas and failed supernovae have slowed iron production.
- The transition from high, early scatter to the small scatter seen in disk stars follows naturally from BHNSMs being relatively frequent early and dropping to about 10% of compact binary mergers after roughly 400 Myr.
- The required compact binary merger rate of about $1800\,\mathrm{Gpc}^{-3}\,\mathrm{yr}^{-1}$ is consistent with current gravitational-wave observations, so the model is not ruled out by them.
- Because the r-process yield calculation ignores direct neutron star swallowing by black holes, the model's BHNSM merger rate is an upper limit and its gravitational-wave emission rate a lower limit; both are testable in future observations.
Reading between the lines
- If future core-collapse simulations show that most stars of 30 to 50 solar masses at low metallicity still explode, the paper's iron-suppression mechanism weakens and the early r-process would need another iron-free source, such as magnetorotational supernovae.
- The same logic predicts a specific abundance signature: the most r-process-enhanced very metal-poor stars should carry the iron pattern of a single prior supernova, which could be tested with detailed yields in the data.
- Replacing the fixed merger delay times with distribution functions would redistribute BHNSM events in $[\mathrm{Fe/H}]$ and likely alter the scatter's shape above $[\mathrm{Fe/H}] \sim -1$; this is a natural next calculation, and the paper explicitly flags it as future work.
- A decisive observational test is already feasible: if gravitational-wave observatories measure the black hole–neutron star merger rate far below roughly $1800\,\mathrm{Gpc}^{-3}\,\mathrm{yr}^{-1}$, the required efficiency of 4% per massive star would be in tension, and another early r-process site would be favored.
Signed reviews
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper presents inhomogeneous Galactic chemical evolution simulations using the ICE model to investigate neutron star-black hole mergers (BHNSMs) as an additional r-process site alongside neutron star mergers (NSMs). It introduces a metallicity-dependent failed-supernova prescription in which, at Z ≤ 10^-2 Zsun, all stars above a threshold mass (20, 25, or 30 Msun, depending on model) collapse to black holes without ejecting iron, and a probability Pr-proc = 4% for a massive star to end in a compact binary merger. The authors argue that BHNSMs require only one prior CCSN, and that the reduced Fe production from failed SNe shifts the age-metallicity relation to lower [Fe/H], together resolving the two issues of r-process enrichment at very low metallicity and the large observed [Eu/Fe] scatter. The simulated [Eu/Fe] distributions are compared visually with SAGA observations and claimed to be in qualitative agreement.
Significance. If the results hold, the paper would establish BHNSMs, enabled by failed supernovae, as a viable complementary r-process site and would connect stellar explodability theory to the Galactic r-process enrichment history. The paper's strengths include a detailed description of the inhomogeneous model, the use of recent PUSH explodability calculations, the explicit testing of three mass thresholds for low-metallicity failed SNe, and an honest discussion of the model's limitations and of the tension between the required CBM rate and LIGO/Virgo constraints. The main significance is however conditional: the central claim rests on an extreme step-function assumption for low-metallicity failed SNe and on visual rather than statistical agreement, so the conclusions currently have the status of a proof-of-concept rather than a robust constraint.
major comments (4)
- [Section 3.2.3] The low-metallicity failed-SN prescription is the load-bearing element of the paper's resolution of the low-metallicity r-process problem, but it is an extreme step-function extrapolation: at Z ≤ 10^-2 Zsun all stars above 20, 25, or 30 Msun are assumed to collapse to black holes without ejecting Fe, whereas the only calculationally grounded input, the solar-metallicity PUSH runs, yields a narrow failed window of 22.8-25.6 Msun. The compactness scaling argument does not justify a sharp threshold because compactness is non-monotonic in progenitor mass. The three thresholds tested are all high-failed-fraction extremes; they do not bracket a realistic low-failed-fraction case. Since the early BHNSM rate and the age-metallicity shift scale directly with the failed fraction, the central claim is not yet robust. I request, at minimum, an additional model with a much smaller low-metallicity failed fraction (or a smooth mass-dependent failure probability) to test whether the qualitative agreement in Fig. 1 survives, and a quantitative statement of how the required Pr-proc would need to change.
- [Section 4.1, Fig. 1] The central claim of 'qualitative agreement' is based on visual inspection of the [Eu/Fe] vs [Fe/H] diagrams, with no statistical comparison (e.g., a Kolmogorov-Smirnov test or a quantification of the scatter ratio as a function of [Fe/H]) between models and observations. Moreover, since the ICE model is stochastic, a single realization per parameter choice is insufficient to establish whether the differences among the 20, 25, and 30 Msun threshold models are significant compared to run-to-run variations. Please provide a quantitative assessment, including multiple realizations or an estimate of the stochastic scatter.
- [Section 5(iv)] The paper is appropriately candid that the CBM probability Pr-proc = 4% is at the upper end of GCE rate estimates and corresponds to ~1800 Gpc^-3 yr^-1, within but near the edge of LIGO/Virgo constraints. The tension becomes stronger when combined with the low-metallicity failed-SN prescription: if the true failed fraction at low Z is lower than assumed, the early BHNSM rate decreases and either the r-process enrichment at low [Fe/H] is lost or Pr-proc must be pushed even higher. This coupling is not analyzed. A sensitivity study showing the allowed region in the (failed fraction, Pr-proc) plane that still reproduces the observed [Eu/Fe] distribution would materially strengthen the constraint claim in the title.
- [Section 5(v) and Section 4.2] The age-metallicity shift argument in Section 4.2 is presented as a central mechanism, but the model uses fixed coalescence times for CBMs, as acknowledged in Section 5(v), and no delay-time-distribution (DTD) cases are run. Because the shift is what allows r-process products to be injected at low [Fe/H], the authors should demonstrate that the qualitative conclusion is insensitive to the adopted coalescence times, or quantify how a DTD changes the low-metallicity onset. As written, the reader cannot tell whether the shift is a robust feature of the scenario or an artifact of the fixed-delay assumption.
minor comments (6)
- [Section 5] The first paragraph of Section 5 contains a duplicated word: 'can be explained explained' should read 'can be explained'.
- [Figure 1 caption] The caption should state explicitly which color corresponds to which threshold model (red for >20 Msun, green for >25 Msun, blue for >30 Msun) so that the figure is self-contained without reference to the text.
- [Sections 3.2.1-3.2.2] The definitions of low/intermediate mass stars are inconsistent: Section 3.2.1 defines LIMS as stars below 8 Msun, while Section 3.2.2 introduces IMS as stars in the range 1-10 Msun; please unify the nomenclature.
- [Section 3.2.4] The values PSNIa = 9×10^-4 and 7.49×10^-4 SNIa events per unit solar mass of stars formed are given without derivation or a supporting citation; a brief justification or reference would improve reproducibility.
- [Equation (4)] Please specify the base of the logarithms (presumably log10) and the units of the lifetime t (presumably Myr) in the text immediately following the equation.
- [Abstract] The abstract's phrase 'qualitatively reproduces' is weaker than the title's 'constrain'; consider aligning the claims, for example by adding a quantitative statement about the tested parameter ranges in the abstract.
Circularity Check
No significant circularity: the r-process rate and failed-SN prescriptions are stated inputs, and the [Eu/Fe] comparison is a forward model, not an inverse fit.
full rationale
I walked the derivation chain from Sections 3.2.3 and 3.2.4 through Section 4. The low-metallicity failed-SN thresholds (all stars above 20, 25, or 30 Msun failing at Z <= 10^-2 Zsun) are introduced explicitly as a 'simplified concept' and as three extreme cases for testing, not as a fit to the observed [Eu/Fe] data. The CBM probability Pr-proc = 4% is set by converting it to an event rate (~1800 Gpc^-3 yr^-1) and comparing it with LIGO/Virgo rates, not by matching Eu abundances. The resulting [Eu/Fe] distributions shown in Fig. 1 are forward-modeled consequences of these stated inputs; the paper never inverts the observed abundances to derive the rate or the thresholds. No load-bearing step reduces to a self-citation: the PUSH explodability calculations (Curtis et al. 2019; Ebinger et al. 2019) are external simulations used at solar metallicity, and the low-metallicity step function is acknowledged as an assumption rather than attributed to those papers. The age-metallicity shift and early BHNSM population follow from the definitions of failed SNe (no Fe ejection) and BHNSMs (one prior CCSN), but these are physical mechanisms, not circular identifications. The main caveat is that the conclusions are conditional on an extreme low-metallicity failed fraction and a high CBM rate; this is an assumption-dependence or robustness concern, not a circularity.
Assumptions & free parameters
free parameters (2)
- CBM formation probability P_r-proc =
4% (1.03e-4 CBM events per solar mass of stars formed)
- Low-metallicity failed SN mass threshold =
Fiducial: all stars > 30 Msun fail at Z <= 10^-2 Zsun; variants >20 and >25 Msun
assumptions (5)
- standard math Schmidt star formation law with density power alpha = 1.5 and Salpeter IMF slope -2.35
- domain assumption BHNSMs eject comparable amounts of r-process matter to NSMs
- ad hoc to paper At Z <= 10^-2 Zsun, all stars above a threshold mass collapse to BHs without ejecting Fe
- ad hoc to paper Fixed coalescence times for compact binary mergers instead of delay time distributions
- domain assumption SNIa Fe yields are independent of metallicity
Cite this review
Pith. "Pith review of Using failed supernovae to constrain the Galactic r-process element production." pith.science (2026). https://pith.science/paper/J4TPXVMI
@misc{pith2026190805617,
author = {Pith},
title = {Pith review of: Using failed supernovae to constrain the Galactic r-process element production},
year = {2026},
howpublished = {\url{https://pith.science/paper/J4TPXVMI}},
note = {Machine review of arXiv:1908.05617}
}
read the original abstract
Rapid neutron capture process (r-process) elements have been detected in a large fraction of metal-poor halo stars, with abundances relative to iron (Fe) that vary by over two orders of magnitude. This scatter is reduced to less than a factor of 3 in younger Galactic disc stars. The large scatter of r-process elements in the early Galaxy suggests that the r-process is made by rare events, like compact binary mergers and rare sub-classes of supernovae. Although being rare, neutron star mergers alone have difficulties to explain the observed enhancement of r-process elements in the lowest metallicity stars compared to Fe. The supernovae producing the two neutron stars already provide a substantial Fe abundance where the r-process ejecta from the merger would be injected. In this work we investigate another complementary scenario, where the r-process occurs in neutron star-black hole mergers in addition to neutron star mergers. Neutron star-black hole mergers would eject similar amounts of r-process matter as neutron star mergers, but only the neutron star progenitor would have produced Fe. Furthermore, a reduced efficiency of Fe production from single stars significantly alters the age-metallicity relation, which shifts the onset of r-process production to lower metallicities. We use the high-resolution [(20 pc)3/cell] inhomogeneous chemical evolution tool `ICE' to study the outcomes of these effects. In our simulations, an adequate combination of neutron star mergers and neutron star-black hole mergers qualitatively reproduces the observed r-process abundances in the Galaxy.
Figures
Reference graph
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